Rubber crawler block



FIG. 1 is a perspective view of a rubber crawler block; and,

FIG. 2 is a front elevational view thereof.

The portions shown in broken lines represent environmental subject matter and form no part of the claimed design. The dot-dash line represents a border between the claimed subject matter and unclaimed environmental subject matter and forms no part of the claimed design. 

The ornamental design for a rubber crawler block, as shown and described. 